How are the trialIntervalType and trialNumberOfIntervals properties associated with a plan affected by the startDate for a subscription using the plan?

Let's say we create a plan with a 1-month free trial as follows (in this case we're using the .NET SDK):

var plan = new createPlan();

plan.active = true;

plan.amount = 10000;

plan.intervalType = intervalType.ANNUAL;

plan.name = "Test Plan";

// numberOfPayments omitted for an open-ended plan

plan.trialIntervalType = trialIntervalType.MONTH;

plan.trialNumberOfIntervals = 1;

plan.planCode = "1_Year_Annual";

Then, when we create a subscription as follows based on the plan to send with a recurring request for a customer, if we don't specify a start date for the sub, would the first payment of the recurring billing be charged one month from the current date since the trial is set for one month in the plan?